There's some interesting meta futility in that statement. It's true of course, as far as it goes. But no one avoids truth because they think it's a rational strategy. They do it because it avoids emotional pain[0].
This is a sort of hard truth about why people avoid hard truths. Telling a truth-avoidant person (which is most of us on at least a few topics) things like this will have very little impact. In fact they've probably already stopped listening.
[0] I was going to say "in the short term" but as someone suffering long-term emotional pain over facing relatively minor truths, well, I'm not sure that qualifier is appropriate.
One thing I read recently that has stuck (it seems obvious) is around hard truths that bring emotional pain.
These truths (whatever they may be) will come to you at random times, mostly when you're not wanting them which makes it even more difficult to deal with. So when they come to you naturally (and they will) , you try to push the thoughts away.
Better is to realize the truths and bring them up at your own time. Think about the hard truths that bring emotional pain when you have control over your personal environment. This way you may be better equipped to deal with it.
I don't want to assign any words or practices for this because there are many, but framing it this way helps.
Yes - so telling hard truths is not for the benefit of the listener, it's for the benefit of the speaker mostly. That's a major point: if I see, but I don't tell, if I have private truths and public lies, it's one small victory for untruths. However much I think I'm not - I'm co-opted in the big lie machine. There is quite a lot of experience with this acquired during the totalitarian communist regimes that existed in eastern Europe <1990s. And a minor point is: the listener may switch off, but a minuscule part of the message may make it's way. May implant a tiny seed of doubt, admittedly very very unlikely. But it's not totally futile. Even if the speaker may decide the price to be paid is too high, for too little gain. (lots of the time)